Date Added: Nov 2012
Carrier Aggregation (CA) and Heterogeneous base stations (HetNets) and are two distinct features of next-generation cellular networks. CA increases transmission bandwidth by aggregating multiple component carriers on the physical layer, while small cells in HetNets are vital for data off-loading and can significantly improve area spectral efficiency compared to using just macrocells. In this paper, the authors propose a tractable multiband multi-tier model for CA in HetNets, where base station positions in each tier follow an independent Poisson Point Process (PPP). Their model incorporates an appropriate notion of load.